Interesting results for getservbyname() performance (and possible changes for /etc/services)
ivazquez at ivazquez.net
Thu Jan 12 11:36:01 UTC 2006
On Thu, 2006-01-12 at 12:02 +0100, Phil Knirsch wrote:
> Now, i know and understand how and why glibc does the getservbyname()
> call as it does (namely, every time opening, reading and parsing the
> file). It neither caches calls nor does any other fancy stuff (how could
> it? The order in the file is arbitrary, so the only possibility is to do
> a linear read and parse of the file).
> Comments and suggestions are of course always welcome.
What about writing (or finding) a NS module that does caching? It can
pull from a sorted bdb using a binary search, unless /etc/services is
newer at which point it rebuilds the database. /etc/services almost
*never* changes, so the rebuild speed shouldn't matter too much.
Ignacio Vazquez-Abrams <ivazquez at ivazquez.net>
gpg --keyserver hkp://subkeys.pgp.net --recv-key 38028b72
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